json encoding and decoding

client/go/internal/vespa/slime/error.go

@@ -0,0 +1,32 @@
+// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+package slime
+
+import "errors"
+
+var (
+	Invalid Value = ErrorMsg("invalid value")
+)
+
+type errorValue struct {
+	emptyValue
+	err error
+}
+
+func ErrorMsg(msg string) Value {
+	return &errorValue{err: errors.New(msg)}
+}
+
+func Error(err error) Value {
+	return &errorValue{err: err}
+}
+
+func AsError(value Value) error {
+	ev, ok := value.(*errorValue)
+	if ok {
+		return ev.err
+	}
+	return nil
+}
+
+func (*errorValue) Valid() bool { return false }

client/go/internal/vespa/slime/inserter.go

@@ -0,0 +1,32 @@
+// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+package slime
+
+type Inserter interface {
+	Insert(value Value) Value
+}
+
+type myInserter func(value Value) Value
+
+func (f myInserter) Insert(value Value) Value {
+	return f(value)
+}
+
+func InsertRoot(root *Value) Inserter {
+	return myInserter(func(value Value) Value {
+		*root = value
+		return value
+	})
+}
+
+func InsertEntry(arr Value) Inserter {
+	return myInserter(func(value Value) Value {
+		return arr.Add(value)
+	})
+}
+
+func InsertField(obj Value, name string) Inserter {
+	return myInserter(func(value Value) Value {
+		return obj.Set(name, value)
+	})
+}

client/go/internal/vespa/slime/inserter_test.go

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+// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+package slime
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestInsertRoot(t *testing.T) {
+	var root Value
+	in := InsertRoot(&root)
+	res := in.Insert(Long(5))
+	assert.Equal(t, int64(5), root.AsLong())
+	assert.Equal(t, int64(5), res.AsLong())
+}
+
+func TestInsertEntry(t *testing.T) {
+	arr := Array()
+	in := InsertEntry(arr)
+	res := in.Insert(Long(5))
+	assert.Equal(t, int64(5), arr.Entry(0).AsLong())
+	assert.Equal(t, int64(5), res.AsLong())
+}
+
+func TestInsertField(t *testing.T) {
+	obj := Object()
+	in := InsertField(obj, "foo")
+	res := in.Insert(Long(5))
+	assert.Equal(t, int64(5), obj.Field("foo").AsLong())
+	assert.Equal(t, int64(5), res.AsLong())
+}